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No. 623,993. Patented May 2, I899.

D. B. DEVORE.

FEEDER FOR STEAM BOILER FURNACES.

(Application filed Oct. 16, 1897. Renewed Sept. 7, 1898.) (No Model.) 2Sheets-Sheet l.

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Patented May 2; I899.

D. B. DEVDRE.

FEEDER FOR STEAM BOILER FURNACES.

(Application filed Oct. 16, 1897. Renewed Sept. 7, 1898.) (No Model.) 2Sheets-Sheet 2.

lmr/en/z orflan 1205 B. 2e yore rm: NORRIS PEI'ERS w. mm'oumou wAsnmmoN.n. c.

UNITED STATES PATENT FFTQEQ FEEDER FOR STEAM-BOILER FURNACES.

SPECIFICATION-forming part of Letters Patent No. 623,993, dated May 2,1899.

Application filed October 16, 1897. Renewed September 7, 1898. SerialNo. 690,444. (No model.)

T 0 all whom it may concern.-

Be it known that I, DANIEL B. DEVORE, a citizen of the United States,residing atWashington, in the District of Columbia, have inventedcertainnew and useful Improvements in Stokers or Feeders forSteam-Boilers and Furnaces; and I do hereby declare the following to bea full, clear and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention hasreference to improvements in stokers or feeders forsteam-boilers and furnaces; and it consists of certain novel features ofconstruction, which will be hereinafter fully described in thespecification, elucidated in the drawings, and pointed out in theclaims.

The object of the present invention is to provide simple, economical,convenient, and efficient means for utilizing pulverized coal orimpalpable dust in furnaces and steamboilers. Many devices have comebefore the public for utilizing these products, but none thus far hasgiven results sufficiently satis factory to warrant their adoption froma practical standpoint. The failures are owing to means employed infeeding and also in producing proper or complete combustion of saidproducts.

The present invention is designed to overcome all these difficulties andat the same time to consume only a minimum amount of fuel involatilizing a maximum bulk of pulverized coal, thus producing anintense heat by the means I employ for producing these results.

My invention consists in introducingtubing transversely within afire-box, the free ends being secured to the water-legs, so that thewater can circulate through said tubes.

My invention further consistsin providing a water-back which ispreferably placed between the rows of tubes and also secured to thewater-legs which constitute said fire-box, the water circulating in asimilar manner as explained with reference to said tubes.

My invention further and mainly consists in surrounding said Water-backwith broken terra-cotta or similar material and held in position by thetransverse tubes previously referred to.

My invention further consists in providing by means of said Water-backan additional or supplemental box or compartment for giving increasedheat to the gases as they are evolved from the heated terra-cott-a pile.

My invention further consists in providing a closed chamber under thesupplemental box for receiving compressed air or superheated steam, incombination with the pulverized coal, and one or more openings from saidchamber for allowing the products to pass through the interstices of theterra-cotta pile Which become red-hot by means of the ordinaryfurnace-fire, thus allowing the pulverized coal or its equivalent tobecome transformed into intensely-heated gases.

My invention further consists in arranging a removable funnel or stokerfor depositing fuel in the fire-box and means for removing or swingingsaid stoker to one side, free from the furnace-door,when occasion mayrequire,

My invention further consists ina reservoir for pulverized coal and anair-pipe entering said reservoir for forcing said coal-dust into afurnace through the medium of a dust-delivery pipe.

To more fully understand my invention I will proceed to describe thedrawings, in which Figure l represents a side elevation and section,partly broken away, of a locomotive and its'accompanying tender,exhibiting my improved device. Figs. 2 and 3 are respectively a centrallongitudinal section and a front elevation of an ordinary steam-boilerand furnace having my device applied thereto.'

My invention consists in securing water pipes or tubes A transversely ina fire-box a and securing said tubes to the water-legs of -the fire-box.Situated centrally between said tubes and alsosecured to the water-legsis a water-back B. Surrounding said Water-back is broken terra-cotta bor similar substance, which is held in position by said transverse tubesA, thus forming a transverse pile across the fire-box, which will behereinafter more fully set forth.

The fire-box has two compartments, which are formed by the terra-cottapile I), previously referred to. The rear compartment is provided with agrate a, of ordinary construction, and a supplemental tilting grate aThese grates support the coal for heating the terracotta pile. The coalis fed to the fire-box by an automatic stoker D, located immediately infront of the furnace-door in the cab of the engine.

\Vhen necessary to examine the interior of the fire-box, the stoker D ispushed to one side through the medium of the hinges (l (I, which adaptit to swing flat against the boiler and away from the throttle-valve,gage-cocks, and reversing-lever. By this arrangement no inconvenience isexperienced by the engineer. The forward compartment of the fireboxgives additional heat to gases as they pass through the boiler-tubes.Immediately under the terra-cotta pile and forming a solid bottom tothis partition of the fire-box is a transverse chamber 0, which isprovided with an opening 0 for allowing the line pulverized coal to beforced through the interstices of the terra-cotta pile by means ofcompressed air or superheated steam.

Located in the tender of the engine is a hermetically-sealed reservoir Gfor holding pulverized coal and which is provided with a cover g.Entering at the bottom of said reservoir is a pipe 11 for supplyingcompressed air or steam for forcing the pulverized product into thefire-box of the engine. The pipe, as shown in the drawings, Fig. 1, canterminate at the bottom of said reservoir, or it can be extended, asshown in dotted lines, and extend to the top and partly enter thefuelsupply pipe of said reservoir. Extending from the top of thereservoir previously referred to is a large pipe G, forming a gooseneck,which is connected to a pipe G by means of a flexible coupling g andextending into the chamber 0 for supplying the pulverized coal, aspreviously stated.

The supplyreservoir is located on the boiler. The compressed-air pipeand fuelsupply pipe are similar to those previously described forfeeding the fuel into the furnace with this exceptionthe delivery end ofpipe G is bifurcated and delivers the pewdered fuel on both sides of thewater-back into the terra-cot-ta pile and not into the closed chamber,as shown in Fig. 1.

Referring to Figs. 2 and 3, the device for removing the stoker issupported bya crane, which is provided with a track and trolley, saidtrolley being connected to the stoker by rods or wire ropes. By thismeans the stoker can be pulled out from the fire-door and then swungaround by its supporting-crane, which is pivoted to cars secured to theboiler.

\Vhen operating my improved device, the reservoir G is filled withpulverized coal or impalpable powder, the manhole-cover g being securelyfastened. The operator starts the fire in the furnace, and after it isunder way the stoker D is filled, when this part of the apparatusbecomes automatic. All that is necessary is to shake the pivoted grate aoccasionally when a larger quantity of coal is required on the fire thanthe stoker can deliver through gravity when not full of coal. As saidfire in transit to the boiler-tubes must consequently pass over andthrough the terracotta pile Z), thus making it red-hot, when this stageis reached the operator opens the valve 7L on the locomotive, whichcarries a current of compressed air or superheated steam into thefuel-reservoir G, (the air-compressor or superheater is not shown in thedrawings, as they are too well known to require illustration,) whichforces or draws the fine particles of pulverized coal through the pipesG, g, and G respectively, into the chamber a, from which it passesthrough the opening 6, through the interstices of the terra-cotta, fromwhich it instantly issues in volumes of intensely heated gases. By thismethod or process of utilizing fine particles of coal or dust there isno clogging of the furnace, which has heretofore been the difficultywith pulverized-feed burners. As the fine fuel is regulated by the valve7L, previously referred to, it is evident the fire can be regulated bythis means of feeding this fine fuel to any degree of temperature. Anarrangement could be devised to make the entire device automatic thatis, make the heat of the furnace operate the valve by means of a leverand expansionrod; but that part of the invention would perhaps be thesubject of another application with other devices connected therewith.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a furnace for steam-boilers and other like purposes, thecombination of water-tubes situated transversely in said furnace, andconnecting with the water-legs of a fire-box, and broken terra-cottapiled between said tubes forming a transverse wall across said fire-boxfor the passage of pulverized coal and the means for feeding said coal,substantially as described.

2. In a furnace for steam-boilers and other like purposes, thecombination of water-tubes situated transversely in said furnace, andconnecting with the water-legs of a fire-box, a water-back locatedcentrally between said tubes, and terra-cotta surrounding saidwater-back for the passage of atomized coal through the medium of anair-blast, substantially as described.

3. In a furnace for steam-boilers and other like purposes, thecombination of water-tubes situated transversely in said furnace, andconnecting with the water-legs of a fire-box, broken terra-cotta piledbetween said tubes forminga transverse Wall across said fire-box, andthe means for heating said terra-cotta pile, pulverized coal passingover and through said terra-cotta pile through the medium of anair-blast or superheated steam, substantially as described.

4. In a furnace for steam-boilers and other like purposes, thecombination of water-tubes situated transversely in said furnace, andconnecting with the water-legs of a fire-box,

IIO

a water-back located between said tubes, a terra-cotta pile surroundingsaid water-back for the passage of atomized coal located in a reservoiror magazine and conveyed by a pipe into a boX located immediately undersaid terra-cotta pile and Water-back, a perforation or opening in saidbox for the aforesaid passage of coal-dust into a terra-cotta pile bymeans of an air-blast or superheated steam substantially as described.

5. In a furnace for steam-boilers, a stoker removably secured before afire door and adapted to feed fuel to a fire-located in a furn ace forheating a terra-cotta pile, of a waterback within said terra-cotta pileand arranged between water-tubes, a steam or air blast for feedingpulverized coal into and through said terra-cotta pile substantially asdescribed.

6. In a furnace for steam-boilers, the combination of water-tubessituated transversely in said furnace, and connecting with thewater-legs of a fire-box, a water-back B, located between said tubes A,and terra-cotta pile b, surrounding said Water-back, for the passage ofatomized coal G, by means of pipes G, g and G into chamber 8, thencethrough open- 8. In a furnace for steam-boilers and other I likepurposes, the combination of a fire-box provided with an ordinary fire,a terra-cotta wall or pile extending across said fire-box, forming twocompartments, a hollow box or chamber under said fire-box, a fuel-supplypipe communicating with 'said chamber, and an air-pipe in anatomized-coal reservoir for forcing said coal into the terra-cotta pile,substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

DANIEL B. DEVORE. Witnesses:

W. RU. EDELEN, HORACE BURDETTE.

